Preheating torch



Dec. 30,

E. H. SMITH PREHEATING TORCH Original Filed June 19, 1919 Patented Dee. 30, 1924.

FFEE

ELMER H. Slli'l-I, OF LINNEAPQLIS, MINNESOTA.

PREHEATNG TORCH.

Application filed Tune 19, i919, Serial No. 305,345.

To all whom t may concern.'

Be it lrnown that l, Emma H. SMITH, a citizen of the United States, resident of Minneapolis, county of Hennepin, State of Minnesota, have invented certain new and useful Improvements in Preheating Torches, of which the following is a specification.

My invention relates to torches designed particularly for preheating metal articles preparatory to welding and the object of the invention is to provide a torch which can be conveniently manipulated and the relativel proportions of air and liquid fuel in the mixture accurately regulated, and the feed of the torch easily controlled.

Other objects of the invention will appear from the following detailed description.

In the accompanying drawings forming part of this specification,

Figure 1 is a view of preheating torch, partially in section, embodying my invention, ,j

Figure 2 is an end view of the same,

Figure 3 is an enlarged detail view, showing the manner of mounting the tip in the heat-containing mixing chamber,

Figure 4 is a sectional view ou the line 4 4 of Figure 3,

Figure ris a sectional view on the line 5-5 of Figure 3.

In the drawing, 2 represents a pipe communicating with a suitable source of air under pressure and 3 is a similar pipe through which the liquid fuel is delivered to the torch nozzle. l may use kerosene, crude oil or any other suitable hydro-carbon that is capable of being atomized to form a preheating flame in the torch. 4 represents the nozzle having a mixing chamber 5 therein communicating with a port 6 in the end of the nozzle in threaded engagement `at 7 vvith a cross bar 8 thatis formed near one end of the chamber 9 ofy the burner 10. Y The nozzle 4 has a lateral extension 1'1 provided with a passageV 12 which communicates with the mixing chamber 5 and with the pipe 3 through vheh the liquid hydrocarbon is supplied to the mining chamber. A tip 13 is fitted into the nozzle 4 and has aA threaded engagement therewith at 14 and is provided with a longitudinal duct 15 that is concentric with the mixing chamber and with the port 6 of the nozzle. The inner end of the tip is preferably tapered and the wall of the mixing chamber is also tapered in a similar Renewed June 12, 1924.

manner so that the narrow annular space may be formed between the tip and the wall of the nozzle through which the liquid hydrocarbon is drawn to be atomized at its point of mixture with the jet of air pressure discharge through the duct of the tip 13. The rear end of the tip is seated in a socket 16 provided in a housing 17 and a cap 18 has threaded engagement with said housing and encircles the tip and forms a close gas and air-tight joint around the tip and a similar cap 18 has a threaded engagement with the rear end of the nozzle 4, preventing the suction of air or gas around the point of entrance of the tip into the nozzle.

l prefer to provide a finger grip 19 on the f tip by means of which it may be adjusted lengthwise to increase or decrease the areaA of the passage` between the tapered inner end of the tip and the tapered walls of the nozzle.

As shown in Figure 4, a series of grooves 2O are formed trans 'ersely of the threads of the tip connecting the rear portion of the mixing chamber with the forward portion thereof, so that when the tip is mounted in the nozzle the hydro-carbon may flow through these grooves to be atomized at the point of mixture with the air under pressure as it is discharged from the tip. rllhis air is released under sufficient pressure to create a partial vacuum in the annular passage in the rear of the nozzle so that the hydrocarbon will be sucked into the mixing chamber and into direct Contact with the jet of air.

rihe liquid hydrocarbon becomes atomized through contact with the jet of air and when ignited, projects the flame through and beyond the burner 10. The operator of the torch, by the manipulation of the finger grip 19, can easily and quickly regulate 'thev feed ofthe liquid through the' mixing cham ber and thereby positively control the flame in the burner.

l prefer also to provide a-valve 21 in theila positions.` The burner l0 is open at-feach end and may be readily detached 'from the nozzle whenever desired.Y f'

I claim as my invention:

l. A preheatiiig torch comprising a nozzle lia-ving a mixing chamber therein and a discharge orifice, a liquid 'fuel pipe communicating with a port inthe side wall of said mixing chamber, a tip having one kend lit-ting Within said mixing chamber and provided with aV linger grip outside said chamber and mounted for movement forward and backward in said chamber, the forward endY oi said ,tip being adjacent the discharge opening in said mixing chainl'ier and iiifiriiially spaced from the walls of said chamber to form a liquid fuel passage, and said tip having a longitudinal duct therethrough com- Vinuiiicating with a source of air underpressure, the suction created by the discharge of air Vironi saidtip drawing the liquidV fuel through vthe Y passage around said tip' toV mingle with'the fluid from said tip.v Y

2. A Vpreheating torch coii'iprising a 'noz- :zle having a mixing chamber therein and a discharge opening at oneend, the wall converging toward said opening, said nozzle also having a port leading to saitL mixing chamber and means for connecting a source of liquid fuel supply with said port, a tip having one end iitting within said nozzle andV mounted for longitudinal adjustment therein and having passages leading from the rear portion vof said mixing chamber Vto lliedischarge orice thereof, said tip having a longitudinal duct therethrough communicating at one end with a source of air under pressure,the discharge of air through said tip .creating a suction between thewallsof said tip and said nozzle and drawingtlie liquid 'fuel 'therethrough 3. .A preheating torch comprising a nozzle having a discharge orifice yand a mixing chamber inthe rear of said ,(iii'liice, the side Y wall of said mixing. chamber having a port communicating with a-liquid fuelv pipe, a

tip fitting within said nozzle and having a stuffing-box connection with the rear portion thereof, and a forward portion of less diameter than the rear portion extendii'ig through said mixing chamber and spaced from the walls thereof, and having a tapered forward end terminating near the junction of said nozzle orifice and said mixing chaini `jber, the forward portion of said tip between said'-fuel-suppli7 port and said nozzle orifice having ancomparatively long threaded con- Vnection with the walls of said mixing chain- 'Ying chamber to the forward section thereof,

the tapered end of said tip being spaced' 'from Ithe walls of said chamber, and said vtip having a fiuid pressure duct therein leading to said nozzle orifice, a vacuum-being created between the tapered'end'of said tip andV the wall v. of said mixing chamber for` sucking the oil 'from said intake port through,V

said ducts'to the orifice of said nozzle?? fl. A prelieating torch comprising a nozzle having mixing chamber therein and' a disvl charge orifice vcommunicating withi'said chamber, the side wall of said chamber having a liquid-fuel intake port, a tip fitting within said nozzle .and extending through said mixng chamber and havnga `tapered end terminating near said nozzle orifice, said tip being spaced from the wa-lls ofsaid' -cliamber and having a longitudinal ductitherein for deliveringa iiuidpressure to the tapered end of said tip and the orifice of said nozzle, said tip having vmeans dividing said 'miXin g chamber into forward and rear 'sections, and communicating passages between said sections through which the liquid 'fuel f may iiow to the orifice of said nozzle, the* 90 end of said tipbeingin the rear of the forward ertreiniti7 of vsaid nozzle orifice and concentricl therewith, and a-hollo'w burnerl hai/ing means atoo'ne'end for mounting on the forward"portion'of said nozzle,V Y

5. A preheating torch comprisinga nozzle having a mixing chamber providedQwith-a discharge orifice, said. chamber having wallsY converging toward said 'orifice,af tip i'ittiiig within said chamber and having 'av tapered end for adjustment toward'andwfroin the converging walls of vsaid ch amber, said `tip having a Vduct therein 'for' delivering air` underfpi'essure to said chamber, said chamof the orifice of said duct and com rnuiiicatber also hav'iiigan intake' port inthe rear ,i i i170 ing with the space between said tip' and their.v

walls of saidchamber', whereb)T a Vsur ion will be created through said port'when pressure is admitted 'toAA said duct, and a liquid fuel pipe under atmosphericpressure*A communicating with said port. v Y

In witness whereof I have hereunto -V set my hand thisfQthVday of lune` 1919;.

Emma eine 

